MANUFACTURER: Daniel Defense FAMILY: Accessories MODEL: M4A1 RIS II Rail Assembly TYPE: Accessory-Rails ITEM GROUP: Rifle Accessories FINISH: Flat Dark Earth FINISH TYPE: Other Finish OVERALL LENGTH: 12.25" WEIGHT: 17.7 oz SHIPPING WEIGHT: 1.9 lbs. ADDL INFO: Free Floating Barrel Design ADDL INFO: Mil-Spec 1913 Picatinny Rails ADDL INFO: Continuous Upper Rail MFG MODEL NO: 01-004-08001 UPC: 852548002820